浅析沙棘根系在砒砂岩地区坡面上的分布  

Study on the Distribution of Root System of Hippophae rhamnoides on the Slope in Sandstone Area

作　　者：武晶[1] 王百田[1] 郭红艳[1] 廖行[1] 

机构地区：[1]北京林业大学水土保持学院水土保持与荒漠化防治教育部重点开放实验室

出　　处：《水土保持研究》2007年第6期374-376,379,共4页Research of Soil and Water Conservation

基　　金：国家科技支撑计划项目“困难立地工程造林技术研究”(2006BAD03A03);水利部“晋陕蒙砒砂岩区沙棘生态建设工程”科技支撑项目

摘　　要：以人工种植在砒砂岩地区坡面上的中国沙棘的根系为研究对象,通过对其不同径级的三个生长指标：根密度、根长、根量进行研究,可以得出：沙棘根系主要分布在0-40 cm土层范围内,这种分布为浅根型分布,且水平根系比较发达。对于径级〈3 mm的根系,它的根密度值在表层最大,之后沿土层深度的增加而减少;其它径级的根系其根密度的实测点分布呈现出表层较少,10-20 cm处最大,20 cm以下沿土层深度的增加而递减的规律。根长随根系径级的增加大致呈现出减小的趋势。根量则反之,随径级的增加而增大。具有固氮能力的根瘤主要分布在0-40 cm的土层内,在表层最多。After researching on the distribution characteristics of the root system of China Hippophae rhamnoides which had been planted on the slope in sandstone area, and analyzing their indices （root density, root length and root weight） in different diameters, this article finally reveals that most of Hippophae rhamnoides roots mainly distributed within 0～40 cm soil depth, and in this shallow distributional type, the level roots were rather flourishing. With root diameter less than 3mm, the maximum of its root density can reach on the surface and then diminished when the soil depth became more and more deep. Whereas, to the root diameter which is more than 3 mm, the value of root density can reached the maximum in the depth of 10 ～20 cm and diminished with the soil depth. With the increasing of root diameter, root Length took on the trend of decreasing, on the contrary, root weight became increasing when the Root diameter increased. The root nodule, which mainly distributed within 0～40 cm soil depth, has the capacity of fixing nitrogen, and its value can reached the maximum on the surface.

关 键 词：沙棘 根系 砒砂岩 坡面 分布 

分 类 号：S793.6[农业科学—林木遗传育种]